If it takes 2500°F to melt steel beams and jet fuel burns at 1300°F and there were hotspots of 2000°F for 6+ weeks after the collapse of the World Trade Centers

If it takes 2500°F to melt steel beams and jet fuel burns at 1300°F and there were hotspots of 2000°F for 6+ weeks after the collapse of the World Trade Centers, what actually caused the steel beams to fail? It wasn't jet fuel. This question is for all of you that screamed "follow the science" durin…